I don't have the meteorological data on hand to determine whether or
not California has experienced windier-than-normal conditions so far this
year. Since you are from the west coast, I will simply take your word for
it, and try to explain how La Niņa may be responsible. If you want to
obtain the data, I would suggest contacting the
National Climatic Data Center.

As you mentioned, the west coast of the United States is nearly always
under the influence of prevailing westerly winds, due to the earth's
rotation. These winds are relatively stronger than winds in other parts of
the country because they flow in off the ocean, where there is very little
friction to slow them down.

La Niņa, like El Niņo, affects the position and intensity of jet streams.
One may expect that for La Niņa to be responsible for higher winds in the
San Francisco area, that the jet stream would be entering the west coast in
the vicinity of central California. However, during La Niņa, the eastern
Pacific jet stream typically enters the west coast near the U.S./Canada
border.

However, the position of upper-level jet streams has a direct influence on
the position and movement of surface weather systems. Areas of low pressure
are often steered by jet stream winds. This is why the jet stream is
sometimes referred to as the 'storm track'.

Remember that air flows counter-clockwise around areas of low pressure.
Therefore, as these areas of low pressure are steered into the Pacific
Northwest, areas to the south (such as California) would feel strong winds
with a westerly component.

To sum it up, it is quite possible that La Niņa has been responsible for
the stronger-than-normal winds that you have been feeling.

For more information than you will probably want to read, check out these
links...